Air-cooled motor



March 31, 1931. c o, -r 1,798,985

AIR GOOIJED MOTOR Filed Jan. 14 192 (la/192206 0. P11962 w INVEN'TOR ATTDHNILY Patented Mar. 31, 1931 UNITED STATES CLARENCE 0. PRIEST, OF ARLINGTON, CALIFORNIA AIR-COOLED MOTOR Application filed January 14, 1928.

This invention relates to improvements in engines and has especial relation to cooling means therefor, an object of the invention being to provide means for subjecting the rear portions of the cylinders of engines to the action of air so as to cool the rear walls of the cylinders, the invention being especially adapted for air cooled airplane e11- gines.

Another object of the invention is the provision of means which are'capable of being attached to an airplane adjacent the engine cylinders to create a suction and draw cool air around the sides and rearwardly at the rear of the cylinders.

With the above and other objects in view, the invention further includes the following novel features and details of construction, to he hereinafter more fully described, illus- 2c trated in the accompanying drawing and pointed out in the appended claims.

In the drawing Figure 1 is a fragmentary sectional view showing the cowl or nose portion of an airplane with the invention applied, one of the cylinders of the engine being illustrated by dotted lines.

Figure 2 is a section 011 the line 2-2 of Figure 1.

Figure 3 is a like View on the line 3-3 of Figure 1.

Referring to the drawings in detail wherein like characters of reference denote corre sponding parts, the reference character 10 indicates a portion of the cowl of an airplane which is provided with an opening 11 through which extends an engine cylinder 12, the latter being provided with fins 18, all of which is of the usual construction.

In engines of this character, their forward or leading portions are subjected to the cooling action of air, while the rear portions of the engine cylinders are not acted upon by the cool air so that only the forward surface of the cylinders acts to reduce temperature.

In order to overcome this difliculty, and provide means whereby the air will act directly upon the rear portions of the cylinders, the present invention provides a hood 14. This hood is rectangular in cross section and Serial No. 246,861.

is shown as mounted upon the upper portion of the cowl 10 at the rear of the cylinder 12. While this provides a convenient means for mounting the hood it is of course not essential that the hood be mounted in this manner as some other convenient means may be provided. The hood is open at opposite ends, the forward open end 15 receiving the rear portion of the cylinder 12. The hood tapers rearwardly so as to provide a relatively small opening 16 at its rear end, this extremity be ing preferably slightly flared as shown at 17.

By reference to Figure 2 of the drawings it will be seen that the suction created through the hood results in air being drawn in at the forward part of the hood around the sides and top of the cylinder 12 and through the fins or flanges 13, the suction created causing the cool airto follow the curvature of the engine cylinder so as to assist in cooling the rear portion of the cylinder.

The invention. is susceptible of various changes in its form, proportions and minor details of construction and the right is herein reserved to'make such changes as properly fall within the scope of the appended claims.

Having described the invention what is claimed is 1. Means for cooling internal combustion engines comprising ahood-like structure in cluding vertically disposed relatively inclined side walls and a top wall connecting the upper edges of the side walls and providing a relatively wide inlet end adapted to be positioned adjacent the rear of an engine cylinder and a restricted outlet end spaced rearwardly an appreciable distance from said cylinder. 7

2. In combination with the cowl of an airplane and an engine cylinder rising from said cowl, a hood open at opposite ends and including relatively and inwardly inclined walls rising from said cowl and disposed rearwardly of said cylinder, and a top wall connecting the side walls.

In testimony whereof I affix my signature.

CLARENCE O. PREST. 

